Your doorbell, now on your phone.
Stick a QR on your door. When someone taps it, your phone alerts you full-screen with a ringtone — wherever you are. No drilling, no wiring, no app for visitors.
No drilling · No wiring · No app for visitors
Doorbell broken? You're not alone.
Doorbells break. Batteries die. Wires snap. An electrician charges €150–300 for a fix that lasts a couple of years. Meanwhile: lost deliveries, guests waiting at the door, couriers walking away.
Average doorbell repair in Spain: €150–300. Replacement in 2 years: another bill.
Knocksser flips the script: nothing to break at the door — everything on the phone you already carry.
Three steps. One minute.
Generate your QR
Pick a plan; we generate a unique QR linked to your phone.
Stick it on your door
Print it and stick it anywhere: door, window, reception.
Get the alert
When someone scans and taps the button, your phone alerts you full-screen with a ringtone — wherever you are.
Visitors install nothing — just their phone camera.
One panel. All your doorbells.
Home, shop, Airbnb, second home. Each QR is its own doorbell — with its own location, log and collaborators. All from one panel.
Rings on your phone. Never missed.
Every time someone taps your QR, your phone rings full-screen with a ringtone — not a silent notification that gets lost in the rest. For now it's alert-only: you can't talk to whoever's at the door yet, but you know right away they've arrived.
You decide when it rings.
Time bands per day of week. Nights, weekends, full days. No rigid presets — your own schedule, as many periods as you need.
Invite your team or family.
One QR, multiple phones ringing at once. For families, businesses or shared flats: whoever sees it first, goes.
Built for
Home
Broken doorbell, no drilling. Know who's at the door even when you're out.
Shop
Zero lost sales: visitor taps, staff phone alerts instantly.
Airbnb & rentals
Guest arrives, you know. No waiting at the door.
Communities & shared flats
One QR, multiple phones. Whoever's free goes down to open.
Frequently asked questions
No. Visitors just scan the QR with their phone camera and tap the button. It runs in the browser — no downloads, no sign-up.
Yes — install Knocksser to get the alerts. They come in full-screen with a ringtone so they don't get buried among other notifications.
Not yet. Knocksser is alert-only for now: it tells you someone tapped your QR. Two-way voice is coming in a future version.
The alert arrives as soon as you're back online.
Yes. Each QR is independent: home, office, warehouse, Airbnb. Each with its own location, schedules and collaborators.
Download the QR from your panel, print it at home or at a copy shop, and stick it wherever you like.
Yes. Knocksser works anywhere with internet. Visitors only need mobile data or WiFi.
Your digital doorbell, ready in a minute.
No drilling. No lock-in. Cancel anytime.
€2.99/mo or €24.99/yr per doorbell.
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